The RMS voltage is only 10V for a square wave. Power of audio amps is calculated based on a sine wave. With a p-p swing of ±10V, the RMS voltage of a sine wave is 7.07V.
The RMS voltage is only 10V for a square wave. Power of audio amps is calculated based on a sine wave. With a p-p swing of ±10V, the RMS voltage of a sine wave is 7.07V.